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Gerber, J A; Tan, W C; Balmer, T E; Salvi, G E; Lang, N P (2009). Bleeding on probing and pocket probing depth in relation to probing pressure and mucosal health around oral implants. Clinical oral implants research, 20(1), pp. 75-8. Oxford: Wiley-Blackwell 10.1111/j.1600-0501.2008.01601.x
